Key lock construction for doors or closures



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KEY LUCK CONSTRUCTION FOR DOORS 0R CLOSURES Filed Aug. 9, 1952 5 Sheets-Sheet 1 I En /am mafia! norwu Mm; 751M124 Nov. 26, 1957 E. w. NCRTH ETAL KEY LdCK CGNSTRUCTION FOR DOORS OR CLOSURES 5' sneaks-sheet 2 Filed Aug. 9. 1952 fiZQiZtO? @dwA/z Z0 720066) v 744m 9 ZAA 8. \kla Nov. 26, 1957 E. w. NORTH ETAL KEY LOCK cous'raucnou FOR DOORS QR CLOSURES Filed Aug. 9, I 1952 5 Sheets-Sheet 3 WW I h I Z :2

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Nov. 26, 1957 E. w. NORTH ETAL KEY LOCK CONSTRUCTION FOR DOORS OR CLOSURES 5 Sheets-Sheet 4 Filed Aug. 9, 1952 Nov. 26, 1957 E. w. NORTH ETAL 2,814,194

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United States Patent KEY LOCK CONSTRUCTION FOR DOORS OR CLOSURES Edwin W. North, Rockford, Ill., and William B. Wilson, La Habra, Califi, assignors to National Lock Company, Rockford, Ill., a corporation of Delaware Application August 9, 1952, Serial No. 303,534

Claims. (Cl. 70146) The present invention relates to builders locks and more particularly to a novel lock assembly for a door having an outer and an inner knob for retracting the latch bolt to permit opening of the door, the inner knob carrying a turn button for locking the latch bolt from the interior, and the outer knob carrying a key-actuated lock for retracting the latch bolt.

Among the objects of the present invention is to provide a novel lock assembly having an inner knob provided with a turn button for locking the latch bolt and retaining the outer knob against turning, an outer knob provided with a key-actuated lock for retracting the latch bolt, and novel camming means actuated by either knob and by the key-actuated lock for controlling retraction of the latch bolt.

Another important object of the present invention is the provision in a lock construction for a door or other closure of a novel means and mechanism for controlling the actuation of a latch bolt whereby the door or closure may be locked from the interior by the manual turning of a button to thereby lock the outer knob against turning movement and retraction of the latch bolt, but permitting retraction of the latch bolt by turning of the inner knob or by the insertion and turning of a key in the outer knob without releasing the locking means or disturbing the setting of the turn button. As the turn button remains in its locked position to which it was manually moved, such locked position will be maintained until manually released and turned to its unlocked position.

Another important object of the present invention is the provision in a door lock of a novel means and mechanism for retracting a latch bolt and including a pair of split tubular cam members and a sleeve disposed within the adjoining ends of these cam members and each provided with camming means for retracting the latch bolt.

A further object is to provide in a door lock construction a novel combination of camming means connected with the inner nkob for retracting a latch bolt upon turning of this knob, camming means connected with the outer knob for retracting the latch bolt upon turning of this knob, means associated with the inner knob for locking the outer knob against retraction of the latch bolt but permitting its retraction by turning of the inner knob, and other camming means associated with the outer knob for permitting retraction of the latch bolt without turning this knob.

The present invention further comprehends the provision of a novel latch assembly including an inner or center tube and a pair of concentrically arranged cams in the form of separate split tubular members each carrying a knob at its outer end and with their inner ends providing camming surfaces arranged in overlapping relation, the inner or center tube reinforcing these cam members and housing the locking mechanism for locking the outer knob against retraction of the latch bolt.

A further object of the present invention is the provision of a novel dead bolt assembly for a latch construc- 2,814,194 Patented Nov. 26, 1957 ICC tion for preventing retraction of the, latch bolt except in the intended manner.

In the drawings:

Figure 1 is a perspective view of the present novel lock construction assembled for use in a door or other closure.

Fig. 2 is a disassembled view of the latch bolt unit or assembly disconnected from the cam tube and lock unit or assembly, the two assemblies being ready for insertion into their respective bores in a door or other closure, after which the inner clamp plate, escutcheon and inner knob are assembled on the cam tube assembly.

Fig. 3 is a perspective view of the outer knob carrying the tumbler lock in which a key has been inserted for unlatching the door from its locked position.

Fig. 4 is an enlarged view in horizontal cross section taken longitudinally through the completely assembled lock construction when mounted in a door or closure.

Fig. 5 is a fragmentary enlarged view in vertical cross section taken longitudinally through the outer knob, its lock cylinder and associated parts.

Fig. 6 is an enlarged view in vertical cross section taken on the line 6-6 of Fig. 4.

Fig. 7 is an exploded or disassembled view in perspective of some of the parts of the cam tube assembly including in sequence the tubular cam member at the outer or lock side of the assembly, the center tube, the locking slide bar spring, the locking slide bar, the turn button stem and the turn button secured to the stem.

Fig. 8 is an end view of the outer end of the center tube and showing the slot or passage for the projected lug of the lock cylinder assembly.

Fig. 9 is a perspective view of the tumbler lock assembly.

Fig. 10 is a perspective view of the parts of Fig. 7 assembled in the encompassing housing and outer clampiug plate with its locking slot or recess and with the outer knob carrying the lock cylinder attached to the outer end of its tubular cam member, the housing and clamping plate being broken away for a clear illustration of the assembled parts and the turn button and its stem shown disposed in unlocked position.

Fig. 11 is a perspective view of the outer cam or tubular member with its lock cylinder, the center tube, the turn button stem and the turn button of Fig. 10, but with the turn button manually rotated through an arc of approximately from the unlocked position of Fig. 10 to its locked position in which the locking slide bar is projected outwardly into seating and locking engagement within its locking slot.

Fig. 12 is a perspective view of the inner cam or tubular cam member and the housing cover, the latter being broken away. This assembly is adapted to receive therein and encompass or overlap the center tube and the turn button stem when completely assembled.

Fig. 13 is a fragmentary, enlarged view in horizontal cross section taken longitudinally through an alternate form of lock construction.

Fig. 14 is a fragmentary view in perspective of the inner end of the tubular cam member employed in the alternate form of Fig. 13, and showing its slot for receiving the projecting end of the turn button for controlling the longitudinal movement of and retaining the locking slide bar in its extended locked position.

Fig. 15 is a view in perspective of the turn button of Fig. 13.

Referring more particularly to the disclosure in the drawings and to the novel illustrative embodiment therein shown, the present lock construction is adapted for use with a door or closure having an outer knob adapted to be locked or unlocked from the interior of a room or enclosure by the rotation of a turn button. When the 3 button is manually turned ormoved to locking position, the inner knob may be turned to retract the latch bolt, but such turning does not release the button from its locked position so that upon again closing the door, the door is locked to the-exterior but subject to being opened from the exterior by a key inserted' into the cylinder of a tumbler lock assembly in the outerknob. However, when the turn button on the inner knob is manually turned or moved to unlocked position, the door may be freely opened from the interior or exterior by a mere turning of either knob which retracts the latch bolt.

As shown in Figs. 1 to 12 inclusive, the novel lock construction comprises an outer knob secured to an outer split cam in the form of a tubular cam member 11' longitudinally slotted at 12 for the reception of a detent 13 slidably received in the slot 12 (Fig. 4). An expans'ible knob spring 14. carries a button or projection 15 which is spring-biased into locking position in an opening 16 in'the outer cam member 11 and in an opening to be aligned therewith in the cylindrical neck 17 or extension of the knob 10.

An inner knob 18 is removably mounted upon an inner split cam or tubular cam member 19 by means of a detent 21' received in the longitudinal slot 22 in the cam member 19. To retain the knob 18 in fixed position upon the cam member, there is provided a snap spring 23 secured at one end in the internal cylindrical surface of the cam member 19 by means of a rivet or the like 24, and at its other or free end this snap spring is provided with a latching button or projection 25 adapted to be received in an opening 26 in the cam member 19 and in an opening to be aligned therewith in the neck. or cylindrical extension 27 of the knob 18.

As shown more clearly in Figs. 5,7 and ll, the outer cam member or split cam tube 11, in addition to its longitudinal slot 12, is longitudinally slotted at its outer end at 28 for receiving and retaining a key lock assembly 29 and is cut away or notched at its opposite or inner end to provide an arcuate camming projection 31 with its spaced longitudinal edges 32 forming spaced camming edges or surfaces, and is further provided with a projection 33 forming a stop or abutment.

The inner carnor cam tube member 19 (Fig. 12) is expanded or enlarged at its inner end and cut away or notched to provide an arcuate camming projection 34 adapted to overlap the arcuate camming projection 31 of the cam tube member 11, and with its spaced edges 35 providing longitudinally extending cam edges or surfaces. The extreme inner end of the cam tube member 19 is adaptedlto abut against the projection 33 forming a stop to dispose these cam members in their proper operative relationship. Adjacent the outer end of this arcuate cam projection 34, this enlargement is provided with an outwardly projecting tongueor lip 36 providing a stop or abutment. The cam tube member 19 is also provided with indentations at either side of the snap spring 23 for preventing dislocation of the button or overstressing of the spring.

A center tube 37 is inserted into and provides a reinforcement for the adjoining camming ends of the cam members 11 and'19 and a carrier housing and supporting locking means as will be later more fully explained. This tube is shown in detail in Fig. 7, and at its outer end is provided with inturned spaced flanges 38 (Fig. 8). and adjacent its other end is provided with a camming slot 39 for receiving a stem pin 41 carried by and projecting from the outer enlarged end 42 of a turn button stem 43. This turn button stem is shown as of tubular construction and carries at its outer end a turn button 44 for rotating this stern through an arc of approximately 90 from its unlocked (Fig. 10) to its locked position (Figs. 4 and 11) as defined by the camming slot 39 in the center tube 37. Intermediate its ends, the center tube 37 is notched at 46 and at 46 (Figs. 7, 10 and ll), with these notches or slots of this center tube so located as to be aligned with the notched portions of the cam tube members 11 and 1 9 and with all of these notches opening outwardly.

Within the center tube 37' is positioned a longitudinally movable and slidably mounted locking slide bar 45 slotted intermediate its length to provide spaced, outwardly extending projections 47 and 48, and a coil spring 49 seating at one end against the longer projection 47- of the slide bar 45 and retained in position upon an outwardly projecting lug 51, and at its other end seating against the spaced inturned flanges 38011 the end of the center tube 37. These flanges are spaced apart for conformably receiving the projecting end 52 on the key lock assembly 29.

This coil spring 49 spring-biases the locking slide bar 45 to the right as shown or toward the inner knob 18 and tends to move this locking slide bar out of its locking position in a slot 53 in the end wall 54 of a stationary housing 55, whenever the turn button 44' is manually turned to its unlocked position to thereby release the stem 43. As the turn button 44 is staked or rigidly attached as 56 (Fig. 4) to the turn button stem 43, release of the turn button 44 and its stem 43 can only be accomplished by a manual turning thereof whereby the stem pin 41 is moved from the upper narrow end (Fig. ll) to the lower end of the camming slot 39 as shown in Fig. 10.

Thus when the turn button 44 is rotated-to the release or unlocked position of Fig. 10, either the inner knob 18 or the outer knob 10 may be turned to retract the latch bolt and permit opening of the door. But when the turn button is turned through an arc of approximately from its unlocked position to lock the door (Fig. 11), the inner knob 18 may be turned to open the door but such turning of this knob does not release the turn button 44 or its locking slide bar 45' and upon again closing, the door is automatically locked and remains locked-until opened from the interior by turning of the knob 18' or by insertion of a key 50 into the key lock assembly 29. In other words, the turn button 44- when once turned to locked position remains in such locking position until manually released by grasping and turning it back to its unlocked position.

The. stationary housing 55 is cut away or notched (Figs. 1 to 4 and 6) to provide an opening 57 aligned with the openings or notches of the outer and inner cam members 11 and 19, the center tube 37 and the locking slide bar 45, with the opening in the housing 55 defined by a pair of inturned and opposed flanges 58 each provided at one end with an inturned or inwardly projecting lip 59. The housing is further provided with spaced and substantially diametrically disposed inturned tonguesv or flanges 61 stamped and bent or formed inwardly from the body of the housing 55 with either providing a fulcrum about which a floating push plate or follower 62 is adapted to pivot or rock. This push plate or follower seats or bears against the end of a pusher or slide member 63, for retracting the latch bolt 64'. This push plate or follower is of substantially greater width at one end and thereat is provided with inturned flanges 65 and at its other or narrower end with similar flanges 66, each bent inwardly as shown in Fig. 6 to form enclosures. The enclosures formed by the flanges 65 are adapted to receive the ends 67 of a coil spring 68 anchored in the housing, with these ends 67 of the spring 68 spring-biasing the follower or push plate 62 to its neutral position. Rocking movement of this floating push plate or follower 62'is effected about either inturned tongue or flange 61 on'the interior of the housing 55.

As clearly shown in Fig. 6, the cam edges 32 and 35 on the arcuate camming projections 31 and 34 of the outer and inner cam membersll and 19, respectively, are adapted to engage the flanged side 'of the follower plate 62 and rock orrotate it to depress the pusher or slide member 63 and retract the bolt. It will also be seen that the arcuate camming edges 69 on the center tube 37 at the slot 46 are adapted to engage the follower or push plate 62 and cause the latter to rotate or rock sufliciently to retract the latch bolt 64 when a proper key 50 is inserted into the tumbler lock and rotated whereby the lug 52 on the end of this tumbler lock rotates the center tube 37 through the required are.

The pusher or slide member 63 (Figs. 4 and 6) is slidably mounted in the reduced inner end 70 of a bolt housing 71, and is adapted to be depressed or forced inwardly into this bolt housing by a rocking movement of the follower or push plate 62 whereby to apply a thrust to force this pusher or slide member 63 forwardly to cause retraction of the latch bolt 64 (Figs. 4 and 6). This pusher or slide member 63 is of channel shape and provided with a longitudinally extending slot 72 in the base or connecting wall 73 thereof, and with aligned longitudinally extending slots 74 in the opposite or side walls 75 thereof. At its forward end this pusher or slide member is provided with a ledge or seat 76 between which and the latch bolt 64 there is interposed a compression spring 77.

Mounted upon and carried by a cross pin 78 within the pusher or slide member 63 is a bolt cam or rocker arm 79. This cross pin 78 extends through the slots 74 in the pusher or slide cam 63, and has its ends secured in the opposite sides of the reduced upper end 70 of the stationary latch bolt housing 71. This rocker arm or bolt cam '79 is provided with a shoe or projection 80 extending into the slot 72 and a projection 81 seating against a flange or lug 82 on the inner end of a bolt bracket 83. The lower end 84 of this bolt bracket is rigidly secured to and carries the latch bolt 64. The spring 77 bears at one end against the latch bolt 64 and at its other end against the seat 76 on the pusher or slide member, whereby to spring-bias the latch bolt to its extended, latching or engaging position in the strike plate A on the adjacent door jamb.

The latch bolt housing 71 is adapted to carry a dead bolt 85 adapted to engage the strike plate A when the door 86 equipped with the present lock assembly is closed. This dead bolt (Figs. 4 and 6) is spring-biased or springactuated to its outer projected position by a coil spring 87 disposed in a longitudinal recess or bore in the dead bolt 85 and bearing at one or its forward end against the dead bolt and at its other or rear end encompassing a reduced end 88 on a spring pin 39 and seating against a shoulder on the pin. This spring pin is also reduced at its inner end 91 to provide an annular shoulder with this end 91 received in and projecting through an opening 92 in the latch bolt housing 71.

The rear face 93 of the dead bolt adjacent the bolt bracket 83 is provided with a longitudinally extending camming surface 94, the lower portion thereof being vertically disposed and merging into an upwardly inclined cam surface. This camming surface 94 is maintained in contact with a laterally projecting lug 95 on one end of a locking bar 96, the other end of this bar being pivotally mounted upon the cross pin 78 carrying the bolt cam or rocker arm 79. A leaf spring 97 having its one end 93 anchored in a slot in the locking bar 96 and its free end bearing against the interior wall of the bolt housing 71, spring-biases and maintains the lug 95 on this locking bar against the camming surface 94. A relatively narrow stop or abutment 99 pnovided on and projecting from the adjacent face of the bolt bracket 83 is so positioned that if the door 86 is closed and the latch bolt 64 is attempted to be forced inwardly by the insertion of a tool or instrument (Fig. 4) against the rounded or tapered face of the latch bolt, retraction or inward movement of the latch bolt in its housing sufficient to unlatch the door is prevented by this stop or abutment 99 on the bolt bracket 83 abutting against and beneath the adjacent, outer end of the locking bar 96, and as the locking bar is mounted at its inner end on the cross pin 78 secured in the bolt housing 71 and its lower end is held spring-biased against the vertical portion of the camming surface 94 in the position shown in Figs. 4 and 6, the latch bolt 64 is prevented from being forced inwardly to unlatched or unlocked position.

However, the pivotally mounted locking bar 96 does not prevent the latch bolt 64 from being retracted in normal operation by rotation of either knob 10 when unlocked, or 18, or by rotation of the key 50. In either event, the retraction of the latch bolt 64 by actuation of the push plate or follower 62 and the pusher or slide member 63, and which members 62 and 63 are not actuated when the latch bolt is attempted to be depressed by means of an instrument, causes the end 63 of the pusher or slide member 63 to engage the shoulder or cam surface 96 on the locking bar 96 to thereby cam this locking bar to the left as viewed in Fig. 6 and move the outer or free end of the locking bar 96 from beneath the aligned stop or abutment 99 ion the bolt bracket 83. The lower or free end of the locking bar 96 is held in this aligned position by the spring 97 and the lug on this locking bar maintained by the spring in contact with the cam surface 94 on the dead bolt 85. Thus when the dead bolt is retracted upon closing the door, the lug 95 follows down along the inclined portion of the cam surface 94 to the position shown in Fig. 6. As the leaf spring 97 maintains the lug 95 on the end of the locking bar 96 against the cam surface 94, the locking bar is moved to the position shown in Figs. 4 and 6 when the latch bolt 64 has entered the strike plate, in which position the lug 95 is directly above the stop or abutment 99.

The key lock assembly 29 includes a plug 101 fitting conformably in the opening 102 in the end of the knob 10, and carrying plural tumblers 103 in radial recesses, a casing 104 carrying aligned drivers 105 for the tumblers and each spring-pressed by a coil spring 106 seating at its upper or outer end against a retainer 107. A plug ring 108 carrying the lug 52 projecting into the center tube 37, encompasses and is atfixed to the inner end of the plug 101 by a pin or the like 109 whereby when the proper key 50 is inserted in the tumbler lock assembly 29, the key may be rotated and it in turn rotates the plug 101 and the plug ring 108 and the latter rotates the center tube 37.

Rotation of the center tube 37 with the locking slide bar 45 in its extended, locked position in the slot 53 in the end wall 54 of the stationary housing 55 is permitted by reason of the slot 46 in the center tube 37 which permits this tube to rotate through an arc sufficient to allow its camming edges 69 to abut and rock the follower or push plate 62 to depress the pusher or slide member 63 and retract the latch bolt 64. At the same time, the arcuate camming projection 31 on the tubular cam member 11 having its camming edges 32 prevented from being rotated by the position of the locking projection 47 on the locking slide bar 45 (Fig. 11), prevents the knob 10 affixed to this cam member 11 from being rotated. However, such locking projection 47 does not prevent the inner knob 18 and its cam member 19 from being rotated to cause its camming edges 35 to rock the follower or push plate 62 and retract the latch bolt.

The end wall 54 of the housing 55 is provided with a hub 111 providing a bearing for rotatably receiving the inner end of the tubular cam member 11 and is externally threaded for detachably receiving the threaded hub of a clamping plate 112. This clamping plate 112 is adapted to bear against the exterior of the door or closure 86 and is held in adjusted position by means of a screw 113 threaded into the end wall 54, with the end of the screw adapted to enter an opening or slot 114 in the exterior clamping plate 112. An escutcheon 115 covers this exterior clamping plate 112 and is preferably held fixed by turning inwardly or indenting its peripheral flange 116 over the peripheral edge of the clamping plate.

The open end of the housing 55 is closed by a cover 47 plate 117 having an outwardly projecting hub 118 encompassing and providing a bearing for rotatably receiving the tubular cam member 19. This cover plate 117 is held in fixed position by crimped or undulated flanges or tongues 119 projecting outwardly in spaced relation from the cylindrical wall of the housing 55. An inner clamping plate 121 is removably mounted on the cover plate 117 by means of spaced projecting machine screws 122 each anchored at one end in an opening 123 in the cover plate 117, with the extended head and adjacent portion of the shank of these screws adapted to be received in spaced keyhole slots (not shown) in the clamping plate 121. It will thus be seen that when the clamping plate is mounted over the heads of these screws 122 and is rotated so that the shanks of these screws are disposed in the narrow ends of the keyhole slots and the screws tightened, this clamping plate 121 bears against the inside of the door 86 and the lock assembly is held in fixed position. An escutcheon 124 is then applied over the clamping plate 121 and detachably held in assembled position by spaced snaps or detents 125 detachably interlocking with the peripheral edge or flange of the clamping plate 121.

Figs. 13, 14 and 15 disclose an alternate or modified construction which differs over the lock construction of Figs. 1 to 12 inclusive, mainly in the center tube, the inner cam member and the associated turn button and locking slide bar assembly. Like reference characters have been applied to like parts.

In this form of the invention, the inner tubular cam member 126 is provided with a slot 127 adapted to receive the projecting end or lug 128 of a turn button 129 projecting through the inner door knob 18. This turn button is provided with an inner, centrally arranged recess or slot 131 adapted to receive the projecting end 132 of a locking slide bar 133 extending longitudinally through the cam tube member 126 and for the greater portion of the length of the center tube 134. Like the locking slide bar 45, it is notched or slotted at 135 with the slot extending between a shoulder 136 and a projection 137 adapted to be received in the slot 53 in end wall 54 of the housing 55 when the slide bar 133 is moved to the locked position of Fig. 13 in which the projecting lug 128 of the turn button 129 is moved from the enlarged end 138 into the reduced neck of the slot 127.

At its outer end the locking slide bar 133 is provided with a longitudinal projection 139 adapted to be received in a bearing or bushing 141 spring-biased inwardly to force the locking slide bar 133 to release position by means of the coil spring 49. Thus when the turn button 129 is moved to release position, the spring moves the hearing or bushing 141 to release the locking slide bar 133.

In place of the snap leaf spring 23 of Figs. 1 to 12 inclusive, the inner knob 18 is attached to the cam tube member 126 by means of an arcuate spring 142 carrying the knob button 25.

From the above description and the disclosure in the drawings, it will be readily seen that the present invention comprehends two pre-assembled units shown separated in Fig. 2 and in Fig. 1 shown combined to form the present lock. The one pre-assembled unit may be referred to as the cam tube assembly and includes the outer knob 10 with its key lock assembly 29, the outer cam tube member 11 and the inner cam tube member 19 with their camming ends 31 and 34 disposed in overlapping relation, the floating follower or push plate 62 positioned in the encompassing stationary housing 55, the inner tubular insert 37 which is encompassed by and reinforces these cam tubes, and the locking slide bar 45. the turn button stem 43 and the turn button 44 all carried by the inner tubular insert 37 or 134 (Fig. 13) and forming the locking mechanism. The other pro-assembled unit may be referred to as the latch bolt assembly and includes the slide or pusher 63, the latch bolt 64 and its actuating mechanism in the latch bolt housing 71, and the 8 face plate assembly B affixed thereto and adapted to be secured to the edge of the door 86.

In the assembly of these pro-assembled units, the cam tube assembly shown at the top of Fig. 2 is inserted from the exterior of the door 86 into and projected part way through the transverse bore in the door capable of con formably receiving the stationary housing 55. Thereupon the latch bolt unit shown at the bottom of Fig. 2 is inserted into its bore in the edge of the door until the end of its pusher or slide member 63 is received in the aligned opening or slot 57 in the housing forwardly of its oppositely projecting lips 59 on the housing 55. When these unit assemblies are so located and aligned, further projecting the cam tube assembly inwardly until its outer clamping plate 112, abuts the outer face of the door, causes the lips 59 to enter the oppositely opening slots or channels 143 in the end of the latch bolt housing 71 and these units are located in their proper assembled relation,

This is shown in Fig. 1. The face plate B is then secured to the edge of the door 86 by screws or the like and the inner clamping plate 121, the inner escutcheon 124 and the inner knob 18 are applied in sequence and secured in their proper operative relation.

It will be further apparent from the disclosure that when the turn button is moved to release or unlocked position, the projection or leg 47 of the locking slide bar 45 (Figs. 4, l0 and 11) or the projection or leg 137 of the locking slide bar 133 (Fig. 13), although disposed in the slot 12 of the outer cam tube member 11, is held out of the slot 53 in the stationary housing 55 so that the cam tube member 11 and its knob 10 may be turned to retract the bolt 64. But when the button is turned to locked position, the projection or leg 47 or 137 (Fig. 13) is moved outwardly or forwardly in the slot 12 and into the slot 53 of the housing 55, whereupon the tube member 11 and knob 10 are prevented from rotating and thus prevented from retracting the latch bolt 64. However, in either form of the invention the latch bolt 64 may be retracted by turning the inner knob 18 and its cam tube member, or the latch bolt may be retracted by turning the lock plug 101 of the lock assembly 29 upon insertion of the proper key 50. whereby to turn the inner or center tube 37 or 134 sufliciently to cause its camming edges to rock the follower or push plate 62 and retract the latch bolt 64.

By the present construction of lock assembly, many of the component parts are capable of use in other types of privacy locks whereby the manufacturer is enabled to supply a complete line of such locks with interchangeable parts, thereby greatly reducing the cost of manufacture as well as the cost of replacement. It further enables the manufacturer or supplier to reduce the number of parts required in the assembly of a complete line of locks.

Although there is herein disclosed a preferred embodiment of the present invention, it is to be understood that the same is but illustrative and susceptible of modification and change, and that the invention comprehends other details, arrangements of parts, features and constructions without departing from the spirit thereof.

Having thus disclosed the invention, we claim:

1. In a lock construction, a pro-assembled cam tube assembly and a pre-assembled latch bolt assembly adapted to be combined when assembled in openings provided in a door, said cam tube assembly including a casing fitting conformably in a transverse opening in the door, a pair of split tubular cam members each journalled in an end wall of the casing, a reinforcing tube conformably re ceived in said members, overlapping camming projections on the adjoining ends of said members for retracting the latch bolt, a floating push plate in said housing adapted to be rocked by rotation of either camming projection, a knob attached to the outer projecting ends of the tubular members at the exterior and interior of the door, a key lock associated with the knob at the exterior of the door and adapted to rotate said inner tube, means associated with the knob at the interior of the door for locking the exterior knob and its cam member against rotation, and camming means on said inner tube for rocking said push plate to retract the latch bolt with the outer knob and its cam member locked against rotation.

2. In a lock construction for a door or other closure, a retractable latch bolt, a cam unit assembly including a casing fitting conformably in a transverse opening in the closure, a pair of split tubular members each journalled in an end wall of the casing, a knob attached to the outwardly projecting ends of said members at the outer and inner sides of the closure and the adjoining ends of said tubular members having camming edges for retracting the latch bolt upon turning of a knob, an inner tube conformably received in and connecting the adjoining ends of the tubular members, said tube being slotted and said casing provided with an opening adjacent the camming ends of said tubular members, a floating follower plate in said casing adjacent said opening and slot of said tube adjacent the camming edges on the adjoining ends of said tubular members and adapted to be rocked by these camming edges to retract the latch bolt, means in said tube and associated with one of said knobs and its tubular member for locking the other tubular member and its knob against turning movement, and means associated with the last mentioned knob for rotating said tube and thereby rocking the follower plate and retracting the latch bolt while this knob and its tubular member remain locked against turning movement.

3. In a lock construction for a door or other closure, a retractable latch bolt, a cam unit assembly including a casing fitting conformably in a transverse opening in the closure, a pair of split tubular members each journalled in an end wall of the casing, a knob attached to each of the outwardly projecting ends of said members at the opposite sides of the closure, camming means on the adjoining ends of said tubular members for retracting the latch bolt upon turning of a knob, an inner tube conformably received in and connecting the adjoining ends of the tubular members, said tube being slotted and said casing provided with an opening adjacent the camming ends of said tubular members, a rocking member in said casing adjacent said opening and slot of said tube and adjacent the camming means on the adjoining ends of said tubular members for retracting the latch bolt when rocked, means in said tube and associated with one of said knobs and its tubular member for locking the other tubular member and its knob to the casing and against turning movement, and a key-actuated lock in said other tubular member for rotating said tube and rocking said rocking member for retracting the latch bolt without release of said locking means.

4. In a lock construction for a door or other closure, a retractable latch bolt, a cam unit assembly including a casing fitting conformably in a transverse opening in the closure, a pair of split tubular members each journalled in an end wall of the casing, a knob attached to each of the outwardly projecting ends of said members at the opposite sides of the closure, camming means on the adjoining ends of said tubular members for retracting the latch bolt upon turning of a knob, an inner tube conformably received in and connecting the adjoining ends of the tubular members, said tube being slotted and said casing provided with an opening adjacent the camming ends of said tubular members, a rocking member in said casing adjacent said opening and slot of said tube and adjacent the camming means on the adjoining ends of said tubular members for retracting the latch bolt when rocked, a locking slide bar slidably mounted in said inner tube and actuated by a turn button on one of said knobs for locking the other knob against turning movement, and a key-actuated lock in the other knob for rotating the inner tube to rock said rocking member and thereby retract the latch bolt.

5. In a lock construction for a door or other closure, a retractable latch bolt, a cam unit assembly including a casing fitting conformably in a transverse opening in the closure, a pair of split tubular members each journalled in an end wall of the casing, a knob attached to each of the outwardly projecting ends of said members at the opposite sides of the closure, camming means on the adjoining ends of said tubular members for retracting the latch bolt upon turning of a knob, a reinforcing sleeve in and connecting the adjoining camming ends of the tubular members, said casing having an opening and said tube being notched adjacent the opening and thereat provided with camming means adjacent the camming ends of said tubular members, a rocking member in the casing and the notched portion of the reinforcing sleeve, a locking slide bar slidably mounted in said sleeve and actuated by a turn button on one of said knobs for locking the other knob against turning movement, and a key-actuated lock in the other knob for rotating the sleeve to cause the camming means of the sleeve to rock said rocking memher and thereby retract the latch bolt.

6. In a lock construction for a door, a retractable latch bolt, a cam unit assembly including a stationary housing fitting conformably in a transverse opening in the door, a pair of longitudinally slotted tubular cam members each rotatably mounted in an end wall of the housing, a knob attached to the outwardly projecting ends of said members at the opposite sides of the door, camming edges on the adjoining ends of said tubular members in said housing for retracting the latch bolt upon turning of a knob and the camming edges of its tubular member, an inner tube conformably received in and connecting the adjoining ends of the tubular members, said tube being slotted intermediate its length and said housing provided with an opening aligned with the slot and the camming edges of said tubular members, the edges of the slotted portion of the inner tube providing camming surfaces aligned with the camming edges of the tubular members, a follower plate in said housing adjacent said opening and in the slot of said inner tube and adjacent the camming edges on said tubular members and the camming surfaces of the inner tube, means for supporting said follower plate in said housing for free, rocking movement, locking means in said inner tube and associated with the knob at the inside of the door and its tubular member for locking the other tubular member and its knob at the outside of the door to the housing and against turning movement, and a key-actuated lock in the knob at the outside of the door and its tubular member for turning said inner tube to cause its camming surfaces to rock the follower plate and retract the latch bolt without release of said locking means.

7. In a lock construction for a door, a retractable latch bolt, a cam unit assembly including a stationary housing fitting conformably in a transvere opening in the door, a pair of longitudinally slotted tubular cam members each rotatably mounted in an end wall of the housing, a knob attached to the outwardly projecting ends of said members at the opposite sides of the door, camming edges on the adjoining ends of said tubular members in said housing for retracting the latch bolt upon turning of a knob and the camming edges of its tubular member, an inner tube conformably received in and connecting the adjoining ends of the tubular members, said tube being slot-ted intermediate its length and said housing provided with an opening aligned with the slot and the camming edges of said tubular members, the edges of the slotted portion of the inner tube providing camming surfaces aligned with the camming edges of the tubular members, rocking means in said housing adjacent the opening and in the slot of said inner tube and adjacent the camming edges on said tubular members and the camming surfaces of the inner tube adapted to retract the latch bolt, a locking member longitudinally movable in the inner tube and having a projection received in the slot of the tubular member carrying the knob at the outside of the door and adapted to be received in a slot in the housing, means in the knob at the inside of the door to move the locking member and cause its projection to enter the slot in the housing, and means in the knob at the outside of the door and its tubular member for turning said inner tube to cause its camming surfaces to pivot said rocking means and retract the latch bolt without release of said locking means.

8. In a lock construction of the type having a latch bolt, a key lock associated with a knob at the outer side of a door and a manually actuated locking button associated with a knob at the inner side of the door, aligned inner and outer longitudinally slotted cam tubes to the outer ends of which the knobs are afiixed and with the adjacent inner ends of these tubes notched to provide overlapping arcuate camming projections, a housing enclosing these camming projections with each cam tube projecting through and rotatable in an end wall of the housing, a longitudinally slotted inner tube received in the adjacent ends of the cam tubes for reinforcing the same, a floating push plate in said housing adapted to be rocked by rotation of a camming projection to retract the latch bolt, a locking member housed within and slidably mounted in the inner tube and in the outer cam tube and guided by their slots, means for connecting the button to said member whereby when the button is moved to locking position it moves said member into locking engagement with the housing and thereby retaining the outer cam tube and its knob against rotation but permitting the inner knob and its cam tube to rotate and retract the latch bolt by turning movement of the arcuate camming projection on said last mentioned cam tube, and camming means on said inner tube for rocking said push plate and retracting the latch bolt by said key lock with the outer knob and its cam tube retained against rotation and without releasing said locking member from looking engagement.

9. In a lock construction of the type having a latch bolt, a key lock associated with a knob at the outer side of a door and a manually actuated locking button associated with a knob at the inner side of the door, aligned inner and outer longitudinally slotted cam tubes to the outer ends of which the knobs are affixed and with the adjacent inner ends of these tubes notched to provide overlapping arcuate camming projections, a housing enclosing these camming projections with each cam tube projecting through and rotatable in an end wall of the housing, a longitudinally slotted inner tube received in the adjacent ends of the cam tubes for reinforcing the same and having cmming means for retracting the latch bolt by said key lock, a rocking member in said housing adapted to be rocked by rotation of a knob and its camming projection to retract the latch bolt, locking mechanism connected to the button and housed within and slidably mounted in the inner tube and in the outer cam tube and provided with a locking projection, said mechanism being actuated by movement of the button to locking position whereby the locking projection is forced into a slot in the housing and retains the outer cam tube and its knob against rotation but permits the inner knob and its cam tube to rotate and retract the latch bolt by turning movement of the arcuate camming projection on said last mentioned tube, and means on said key lock for actuating the inner tube and its camming means to retract the latch bolt but without releasing said locking projection from its slot in the housing.

10. In a lock construction for a door or other closure, a retractable latch bolt, a cam unit assembly including a casing fitting conformably in a transverse opening in the closure, a pair of split tubular members each journalled in an end wall of the casing, a knob attached to each of the outwardly projecting ends of said members at the opposite sides of the closure, camming means on the adjoining ends of said tubular members for retracting the latch bolt upon turning of a knob, an inner tube conformably received in and connecting the adjoining ends of the tubular members, said tube being slotted and said casing provided with an opening adjacent the camming ends of said tubular members, a rocking member in said casing adjacent said opening and slot of said tubeand adjacent the camming means on the adjoining ends of said tubular members for retracting the latch bolt when rocked, manually actuated locking means in said inner tube and associated with the inner knob and its tubular member for locking the other tubular member and its knob against turning movement, and means in said other tubular member and its knob for rotating said tube and thereby actuating said rocking member for retracting the latch bolt without release of said locking means.

References Cited in the file of this patent UNITED STATES PATENTS 1,880,675 Baume Oct. 4, 1932 1,918,719 Schlage July 18, 1933 1,991,031 Schlage Feb. 12, 1935 2,424,782 Voight et al July 29, 1947 2,544,959 Hillgren Mar. 13, 1951 2,576,648 Smith Nov. 27, 1951 2,591,647 Welch Apr. 1, 1952 2,618,955 Cerf Nov. 25, 1952 2,662,386 Hillgren Dec. 15, 1953 2,664,306 Cerf Dec. 29, 1953 2,669,474 Kanell Feb. 16, 1954 2,683,367 Hillgren July 13, 1954 

